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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value, Liability	$ (44,800)
Preferred Distribution Rate Reset Election | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value, Liability	(44,795)	$ (40,840)
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	667	3,431
Derivative Asset, Fair Value, Gross Liability	(667)	(1,361)
Derivative Asset	0	2,070
Derivative Liability, Fair Value, Gross Liability	(1,243)	(1,361)
Derivative Liability, Fair Value, Gross Asset	667	1,361
Derivative Liability	(576)	0
Not qualifying or not designated as hedges under accounting rules | Swap | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,163	1,274
Not qualifying or not designated as hedges under accounting rules | Swap | Current Liabilities - Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(77)	(125)
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	469
Derivative Asset, Fair Value, Gross Liability	(2)	(44)
Derivative Asset	0	425
Derivative Liability, Fair Value, Gross Liability	(164)	(44)
Derivative Liability, Fair Value, Gross Asset	2	44
Derivative Liability	$ (162)	$ 0

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